The disclosed invention relates to an optical integrated device, an optical pickup, and an optical disk apparatus, and is applicable to an optical disk apparatus for playing back a compact disk (CD) and a DVD (Digital Video Disk), thereby to access a plurality of types of optical disks with a simple arrangement. For dividing feedback light with a hologram 19A and detecting the divided feedback light with a light-detecting element 20, laser sources 15A, 15B having different wavelengths are spaced a predetermined distance D from each other in order to compensate for the difference between the diffraction angles &thgr;A1, &thgr;B of the hologram 19A.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An optical integrated device for applying a first or second laser beam to a recording medium, detecting feedback light of said first or second laser beam from the recording medium, the optical integrated device comprising: a first laser beam source for emitting said first laser beam having a first wavelength; a second laser beam source spaced a predetermined distance from said first laser beam source, for emitting said second laser beam having a second wavelength different from said first wavelength; a sealing member for dividing each of said emitted first and second laser beams into a plurality of rays and diffracting said feedback light of said first or second laser beam; and a light-detecting element for commonly detecting said diffracted feedback light of said first or second laser beam, with respect to at least a certain one of the rays divided by said sealing member.
2. The optical integrated device according to claim 1 , wherein said first and second laser beam sources are integrated on one semiconductor chip.
3. The optical integrated device according to claim 1 , wherein said first and second wavelengths are 780 nm and 650 nm, respectively, and that said predetermined distance ranges from 10 m to 500 m.
4. The optical integrated device according to claim 1 , wherein said sealing member comprises a hologram so that a diffraction angle is changed according to the wavelength of said laser beam.
5. The optical integrated device according to claim 1 , wherein said light-detecting element has a plurality of photo-detector surfaces for receiving the plurality of rays.
6. The optical integrated device according to claim 1 , wherein said first and second laser beam sources and said light-detecting element are mounted on a semiconductor substrate.
7. The optical integrated device according to claim 6 , wherein said first laser beam source emits the first laser beam having a larger wavelength than the second laser beam emitted from the second laser beam source, and said first laser beam source is located farther from the light-detecting element.
8. An optical pickup device for applying a first or second laser beam to an optical disc and detecting feedback light of said laser beam, said optical pickup device comprising: laser beam focusing means for focusing the first or second laser beam to the optical disc; a first laser beam source for emitting said first laser beam having a first wavelength; a second laser beam source spaced a predetermined distance from said first laser beam source, for emitting said second laser beam having a second wavelength different from said first wavelength; a sealing member for dividing each of said emitted first and second laser beams into a plurality of rays and diffracting said feedback light of said first or second laser beam; and a light-detecting element for commonly detecting said feedback light corresponding to said first laser beam and said feedback light corresponding to said second laser beam, with respect to at least a certain one of the rays divided by said sealing member, wherein said first laser beam source, said second laser beam source, said sealing member, and said light-detecting element are incorporated into an integrated optical device.
9. The optical pickup device according to claim 8 , wherein said first and second laser beam sources are integrated on one semiconductor chip of the optical integral device.
10. The optical pickup device according to claim 8 , wherein said first and second wavelengths are 780 nm and 650 nm, respectively, and that said predetermined distance ranges from 10 m to 500 m.
11. The optical pickup device according to claim 8 , wherein said sealing member comprises a hologram so that a diffraction angle is changed according to the wavelength of the first or second laser beam.
12. The optical pickup device according to claim 8 , wherein said light-detecting element has a plurality of photo-detector surfaces for receiving the plurality of rays.
13. The optical pickup device according to claim 8 , wherein said first and second laser beam sources and said light-detecting element are mounted on a semiconductor substrate, and are juxtaposed in the radial direction of the optical disc.
14. The optical pickup device according to claim 13 , wherein said first laser beam source emits the first laser beam having a larger wavelength than the second laser beam emitted from the second laser beam source, and the first laser beam source is located farther from the light-detecting element.
15. An optical disc apparatus for recording data on and/or reproducing data from an optical disc, the optical disc apparatus comprising: laser beam focusing means for focusing a first or second laser beam to the optical disc; a first laser beam source for emitting said first laser beam having a first wavelength; a second laser beam source spaced a predetermined distance from said first laser beam source, for emitting said second laser beam having a second wavelength different from said first wavelength; a sealing member for dividing each of said emitted first and second laser beams into a plurality of rays and diffracting said feedback light of said first or second laser beam; a light-detecting element for commonly detecting said feedback light corresponding to said first laser beam and said feedback light corresponding to said second laser beam, with respect to at least a certain one of the rays divided by said sealing member; and a processor for generating an output signal based on the feedback light which received the light-detecting element, wherein said first and second layer beam sources said light detecting element, said sealing member, and said processor are incorporated into an integrated optical device.
16. The optical disc apparatus according to claims 15 , wherein said first and second laser beam sources are integrated on a semiconductor chip of the integrated optical device.
17. The optical disc apparatus according to claim 15 , wherein said first and second wavelengths are 780 nm and 650 nm, respectively, and said predetermined distance ranges from 10 m to 500 m.
18. The optical disc apparatus according to claim 15 , wherein said sealing member comprises a hologram so that a diffraction angle is changed according to the wavelength of laser beam.
19. The optical disc apparatus according to claim 15 , wherein said light-detecting element has a plurality of photo-detector surfaces for receiving the plurality of rays.
20. The optical disc apparatus according to claim 15 , wherein said first and second laser beam sources and said light-detecting elements are mounted on a semiconductor substrate of the integrated optical device, which are juxtaposed in the radial direction of the optical disc.
21. The optical disc apparatus according to claim 20 , wherein said first laser beam source emits the first laser beam having a longer wavelength than the second laser beam emitted from the second laser beam source, the first laser beam source is located farther from the light-detecting element.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
June 23, 2000
July 6, 2004
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